Special Section on Photons Plus Ultrasound: Imaging and Sensing

Real-time full-field photoacoustic imaging using an ultrasonic camera

[+] Author Affiliations
Oluwaseyi Balogun, Brad Regez

Northwestern University, Department of Mechanical Engineering, 2137 North Tech Drive, Evanston, Illinois 60208

Hao F. Zhang

University of Wisconsin-Milwaukee, Department of Electrical Engineering and Computer Science, P.O. Box 784, Milwaukee, Wisconsin 53201

Sridhar Krishnaswamy

Northwestern University, Department of Mechanical Engineering, 2137 North Tech Drive, Evanston, Illinois 60208

J. Biomed. Opt. 15(2), 021318 (April 28, 2010). doi:10.1117/1.3420079
History: Received August 01, 2009; Revised March 10, 2010; Accepted March 16, 2010; Published April 28, 2010; Online April 28, 2010
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A photoacoustic imaging system that incorporates a commercial ultrasonic camera for real-time imaging of two-dimensional (2-D) projection planes in tissue at video rate (30Hz) is presented. The system uses a Q-switched frequency-doubled Nd:YAG pulsed laser for photoacoustic generation. The ultrasonic camera consists of a 2-D 12×12mm CCD chip with 120×120 piezoelectric sensing elements used for detecting the photoacoustic pressure distribution radiated from the target. An ultrasonic lens system is placed in front of the chip to collect the incoming photoacoustic waves, providing the ability for focusing and imaging at different depths. Compared with other existing photoacoustic imaging techniques, the camera-based system is attractive because it is relatively inexpensive and compact, and it can be tailored for real-time clinical imaging applications. Experimental results detailing the real-time photoacoustic imaging of rubber strings and buried absorbing targets in chicken breast tissue are presented, and the spatial resolution of the system is quantified.

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© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Oluwaseyi Balogun ; Brad Regez ; Hao F. Zhang and Sridhar Krishnaswamy
"Real-time full-field photoacoustic imaging using an ultrasonic camera", J. Biomed. Opt. 15(2), 021318 (April 28, 2010). ; http://dx.doi.org/10.1117/1.3420079


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